Earlier quoted context omitted.
Do they accept this for people not in the US yet? Also, does Amazon switch rates automatically based on the transaction, or do they force you to pick an account as well?
Amazon does --- but it costs 1% more for transactions outside of the US. Also, Amazon's rates automatically change based on the amount you are charging. All of this info is here: http://aws.amazon.com/fps/pricing/
Fantastic, thank you.